I've been using Logic 9 for over a year on my macbook and have had no problems with a delay in vocal or instrumental recordings before. I use an audio box and a Rode NT1-A Microphone to record to Logic. Although I have fiddled with Logic and programs like fruity loops for over 5 years I'm still not a pro, I'm not skilled in the technicalities like this that come up and have no idea what the problem is except for the fact that it's likely a problem with latency. What I'm confused about is why this just started being a problem, when every other song recorded has worked like a charm. Processor Speed: 1.83 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 2 MB Memory: 2 GB Bus Speed: 667 MHz Boot ROM Version: MB11.0061.B03 System Version: Mac OS X 10.6.6 (10J567) Kernel Version: Darwin 10.6.0 Boot Volume: Macintosh HDD My I/O Buffer size has always been at 256, though the recording delay, I think, may have been mixed around by a friend of mine who was playing around with Logic. It's at -1000 samples right now when I was sure it was around 2000 last I remember (could be wrong, naturally). So how many samples SHOULD I be at? Or what other changes might fix this? I might as well also mention that I am recording vocals to an instrumental sent to me from a friend, while normally I compose the beat in logic myself, so I was also thinking it may have something to do with Logic trying to automatically correct a tempo that doesn't need to be corrected. Thanks in advance. -Joey.